feat: Add sample sketch for context usage

Author: arcadien

examples/SerialCommandsSimpleContext/SerialCommandsSimple.ino

@@ -0,0 +1,78 @@
+/*--------------------------------------------------------------------
+Author		: Pedro Pereira
+License		: BSD
+Repository	: https://github.com/ppedro74/Arduino-SerialCommands
+
+SerialCommands Simple Demo
+
+--------------------------------------------------------------------*/
+#include <Arduino.h>
+#include <SerialCommands.h>
+
+// Pin 13 has an LED connected on most Arduino boards.
+// Pin 11 has the LED on Teensy 2.0
+// Pin 6  has the LED on Teensy++ 2.0
+// Pin 13 has the LED on Teensy 3.0
+const int kLedPin = 13;
+
+class SampleClass {
+
+  char serial_command_buffer_[32];
+  SerialCommands serial_commands_(&Serial, serial_command_buffer_,
+                                  sizeof(serial_command_buffer_), "\r\n", " ");
+  uint8_t myAttribute;
+
+public:
+  // called for ON command
+  void cmd_led_on(SerialCommands *sender) {
+
+    SampleClass *parent = static_cast<SampleClass *>(sender->context);
+    parent->ledOnCounter++;
+    sender->GetSerial()->print("Led was on ");
+    sender->GetSerial()->print(parent->ledOnCounter);
+    sender->GetSerial()->println("times");
+
+    digitalWrite(kLedPin, HIGH);
+    sender->GetSerial()->println("Led is on");
+  }
+
+  // called for OFF command
+  void cmd_led_off(SerialCommands *sender) {
+    digitalWrite(kLedPin, LOW);
+    sender->GetSerial()->println("Led is off");
+  }
+
+  // Note: Commands are case sensitive
+  SerialCommand cmd_led_on_("ON", cmd_led_on);
+  SerialCommand cmd_led_off_("OFF", cmd_led_off);
+};
+
+void SampleClass() {
+  ledOnCounter = 0;
+  serial_commands_.context = this;
+  serial_commands_.SetDefaultHandler(cmd_unrecognized);
+  serial_commands_.AddCommand(&cmd_led_on_);
+  serial_commands_.AddCommand(&cmd_led_off_);
+}
+void loop() { serial_commands_.ReadSerial(); }
+
+// This is the default handler, and gets called when no other command matches.
+void cmd_unrecognized(SerialCommands *sender, const char *cmd) {
+  sender->GetSerial()->print("Unrecognized command [");
+  sender->GetSerial()->print(cmd);
+  sender->GetSerial()->println("]");
+}
+
+SampleClass sampleClass;
+
+void setup() {
+  Serial.begin(57600);
+
+  // Configure the LED for output and sets the intial state to off
+  pinMode(kLedPin, OUTPUT);
+  digitalWrite(kLedPin, LOW);
+
+  Serial.println("Ready!");
+}
+
+void loop() { sampleClass.loop(); }